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RedHat 9 (Linux i386) - man page for mkdir (redhat section 2)

MKDIR(2)						     Linux Programmer's Manual							  MKDIR(2)

mkdir - create a directory
#include <sys/stat.h> #include <sys/types.h> int mkdir(const char *pathname, mode_t mode);
mkdir attempts to create a directory named pathname. mode specifies the permissions to use. It is modified by the process's umask in the usual way: the permissions of the created file are (mode & ~umask). The newly created directory will be owned by the effective uid of the process. If the directory containing the file has the set group id bit set, or if the filesystem is mounted with BSD group semantics, the new directory will inherit the group ownership from its parent; oth- erwise it will be owned by the effective gid of the process. If the parent directory has the set group id bit set then so will the newly created directory.
mkdir returns zero on success, or -1 if an error occurred (in which case, errno is set appropriately).
EPERM The filesystem containing pathname does not support the creation of directories. EEXIST pathname already exists (not necessarily as a directory). This includes the case where pathname is a symbolic link, dangling or not. EFAULT pathname points outside your accessible address space. EACCES The parent directory does not allow write permission to the process, or one of the directories in pathname did not allow search (execute) permission. ENAMETOOLONG pathname was too long. ENOENT A directory component in pathname does not exist or is a dangling symbolic link. ENOTDIR A component used as a directory in pathname is not, in fact, a directory. ENOMEM Insufficient kernel memory was available. EROFS pathname refers to a file on a read-only filesystem. ELOOP Too many symbolic links were encountered in resolving pathname. ENOSPC The device containing pathname has no room for the new directory. ENOSPC The new directory cannot be created because the user's disk quota is exhausted.
SVr4, POSIX, BSD, SYSV, X/OPEN. SVr4 documents additional EIO, EMULTIHOP and ENOLINK error conditions; POSIX.1 omits ELOOP. There are many infelicities in the protocol underlying NFS. Some of these affect mkdir.
mkdir(1), chmod(2), mknod(2), mount(2), rmdir(2), stat(2), umask(2), unlink(2) Linux 1.0 1994-03-29 MKDIR(2)